Management method by using rapid non-volatile medium as cache

Abstract

The invention provides a management method by using a rapid non-volatile medium as a cache. According to the method, a solid-state hard disk is used as a caching device, each caching device is shared by multiple disks, and each disk can only use one caching device; the caching device is divided into a region structure, and mapping connection is adopted between the caching devices and the disks; the caching device is divided into two parts, the front part is used for storing the region data structure in a memory, and the back part is a cache. The method provided by the invention adopts a policy that metadata can be written in the solid-state hard disk in real time to solve the problem, and synchronizes the metadata for managing the dirty data in an assigned position of the solid-state hard disk while the dirty data are written in the solid-state hard disk, so that all the data cached in the solid-sate hard disk without being written in the conventional disk can be read only by reading the metadata when the system is restarted, and further all the data can be prevented from being lost when the system breaks down and is in power failure.

Description

technical field [0001] The invention relates to disk cache management technology, in particular to a management strategy for caching data of slow disks in high-speed non-volatile media. Background technique [0002] Disk cache is divided into read cache and write cache. Read cache means that the operating system keeps the file data that has been read in the memory space when the memory is relatively free. When the software or user reads the same file again next time, it does not need to read it from the disk again, thereby improving rate. Write cache actually saves the data to be written to the disk in the memory space allocated by the system for write cache, and when the data saved in the memory pool reaches a certain level, the data is saved to the hard disk. This can reduce the actual disk operations, effectively protect the disk from damage caused by repeated read and write operations, and also reduce the time required for writing. According to different writing metho...

AI Technical Summary

Problems solved by technology

[0003] However, with volatile devices such as memory, the data cached on high-speed devices will be lost after a system crash or power failure. is unbearable

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